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@Lags
@wgr73 is the best I have ever dealt with tuning any vehicle l. His tunes have been getting rave reviews from basic tunes to stage 2 trucks all with great results. It's the best thing you could ever do to these trucks (tunning the ecm), you wont regret it.
I havent run MPT but have been in MPT tuned trucks. They run great but my money went with COBB simply due to reputation and customer service that I have personally received.